<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 2. 为 ECharts 准备一个定义了宽高的 DOM -->
      <div id="main" style="width: 600px; height: 400px"></div>
    </el-card>
  </div>
</template>
<script>
// 1. 引入echarts
import * as echarts from 'echarts'
export default {
  data() {
    return {
      options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
    }
  },
  methods: {
    deepMerge(obj1, obj2) {
      for (const key in obj2) {
        // 如果target(也就是obj1[key])存在，且是对象的话再去调用deepMerge，否则就是obj1[key]里面没这个对象，需要与obj2[key]合并
        obj1[key] =
          obj1[key] && obj1[key] instanceof Object
            ? this.deepMerge(obj1[key], obj2[key])
            : (obj1[key] = obj2[key])
      }
      return obj1
    }
  },
  created() {},
  async mounted() {
    // 3.基于准备好的dom，初始化echarts实例
    const myChart = echarts.init(document.getElementById('main'))
    // 获取图标数据
    const { data: res } = await this.$http.get('reports/type/1')
    if (res.meta.status !== 200) {
      this.$message.error('获取图表数据失败')
    }

    // 4. 指定图表的配置项和数据
    const option = this.deepMerge(res.data, this.options)
    // console.log(res.data)
    // console.log(option)
    // 5. 使用刚指定的配置项和数据显示图表。
    myChart.setOption(option)
  }
}
</script>
<style lang="less" scoped>
</style>
